Abstract: When a laser beam irradiates a cylinder shell, the irradiated area becomes softer and the cylinder shell will be destroyed. In this paper, a 3-D solid element was adopted to simulate the stresses of internally pressured static and rotational cylinder shells irradiated by laser. It was contrastively analyzed by numerical simulation that the crack initiated from the beam spot edge at both static and rotational cylinder shells. In addition, the fracture occurred simultaneously at the whole outer cycle through the beam center of the rotational cylinder shell. It is concluded that the static cylinder shell will be destroyed more probably at the condition of the same laser power.